What question did this study set out to answer?

The aim is to develop Cu,N-codoped carbon dots for detecting Fe(III) and Cr(VI) in water samples.

May 6, 2026Open Access

Designing green-emissive Cu,N-codoped carbon dots by pyrolysis of aromatic precursors and application in sensing of Fe( iii ) and Cr( vi )

TNThien-Phuc NguyenHo Chi Minh City University of Technology and Education NTNhu Vo Thi ThuHo Chi Minh City University of Technology and Education MHMinh Hao HoangHo Chi Minh City University of Technology and Education

Key Points

The aim is to develop Cu,N-codoped carbon dots for detecting Fe(III) and Cr(VI) in water samples.
Used pyrolysis of aromatic precursors to synthesize Cu,N-codoped carbon dots.
Evaluated dual-analyte sensing capabilities for Fe(III) and Cr(VI) with low limits of detection.
Cu,N-CDs have a detection limit of 1.48 µM for Fe(III).
Cu,N-CDs have a detection limit of 19.6 nM for Cr(VI), showing high selectivity.
Quenching of fluorescence for Cr(VI) primarily occurs due to the inner filter effect.

Abstract

formation of a non-fluorescent coordination complex with surface functional groups of the Cu,N-CDs, while Cr(vi) quenching arises primarily from the inner filter effect. The Cu,N-CDs offered high selectivity with low limits of detection for Fe(iii) (1.48 µM) and Cr(vi) (19.6 nM). The scalable, solvent-free synthetic strategy and the dual-analyte sensing capability demonstrated here position these Cu,N-CDs as promising platforms for practical deployment in environmental water monitoring, food safety screening for detection of heavy metal pollutants.

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